Chatrie v. United States
Decision
The Supreme Court ruled that police conduct a Fourth Amendment search when they use geofence warrants to obtain cell-phone location history data from companies like Google.
The Court decided that the government must follow the Fourth Amendment when it asks tech companies for 'geofence' data—a tool used to identify every cell phone in a specific area during a crime.
Plain-English summary generated by AI from the Court's published opinion on June 30, 2026. Always read the official opinion for the controlling text.
Key Takeaways
- 01Collecting cell-phone location history through a geofence warrant counts as a 'search' under the Fourth Amendment.
- 02Individuals have a 'reasonable expectation of privacy' in the data that tracks their physical movements.
- 03The Court rejected the idea that users lose their privacy rights just because they 'shared' their location with a tech company to use an app.
Inside the Court
- Opinion by
- Per Curiam
- Dissent
- AlitoThomas
Why It Matters
This ruling clarifies that digital records of where you go are private, even if a company stores that data for you, limiting how police can use 'digital dragnets' to find suspects.
Who Is Affected?
Smartphone Users
Users gain constitutional protection for their digital movement history even if they use location-based apps.
Law Enforcement
Investigators must now meet Fourth Amendment standards, such as showing probable cause, before using geofence tools to solve crimes.
Technology Companies
Companies like Google are confirmed as keepers of private data that the government cannot seize without meeting specific legal thresholds.
What Happened?
In 2019, police used a 'geofence warrant' to identify a suspect in a Virginia credit union robbery. The warrant required Google to search its 'Location History' database for every phone near the bank during the robbery. Through a multi-step process that narrowed down anonymized data to specific names, police identified Okello Chatrie. Chatrie argued that taking this data without a traditional warrant based on him specifically violated his right against unreasonable searches.
Legal Question
Does the government conduct a Fourth Amendment search when it accesses a person’s cell-phone location history records held by a third party?
Why the Court Ruled This Way
Technological records providing a detailed and encyclopedic portrait of a person’s movements create a reasonable expectation of privacy. Justice Kagan, writing for a 5-justice majority, held that the police conducted a search because Location History data is even more precise and revealing than the cell-site data protected in the Carpenter precedent. The Court found that users do not 'voluntarily share' this deeply personal information in a way that eliminates privacy protections just by using modern smartphone features. Because the Fourth Amendment applies, the government’s acquisition of such data must generally be reasonable and supported by a valid warrant, though the Court left it to lower courts to decide if this specific warrant met those standards.
Arguments in Favor
Supporters of the decision argue that because smartphones are essential to modern life and track movements into private spaces like homes or doctor's offices, the Constitution must protect this digital trail from automated police surveillance. They contend that the sheer detail of location history makes it a private record that should not be available to the government without specific justification.
Arguments Against
Critics of the ruling, including the government, argue that users choose to enable location services for their own benefit and therefore have a lower expectation of privacy in data they share with a company. They also suggest that because the police only saw a small window of data near a crime scene, it was not the kind of 'all-encompassing' surveillance that requires a high constitutional bar.
Timeline
May 20, 2019
A credit union was robbed in Midlothian, Virginia.
Police had limited evidence but saw the suspect appearing to use a cell phone on surveillance footage.
June 14, 2019
Police applied for a geofence warrant.
The warrant required Google to provide data for phones within a 150-meter radius of the robbery.
March 2022
A District Court ruled the warrant was unconstitutional.
The court found a violation but did not throw out the evidence because it believed the police acted in 'good faith.'
June 29, 2026
Supreme Court issued its decision.
The Court officially recognized that obtaining this location data is a search under the Fourth Amendment.
What This Means for Everyday Americans
For the average person, this means your phone is not an open book for the government just because you use Google Maps or weather apps. Even if you 'opt-in' to certain features for your own convenience, the police cannot easily look through those records to see where you were at a specific time without a judge's oversight. This ruling treats the digital records of your physical movements as private property, similar to the papers in your home. It ensures that as technology changes, the government's ability to watch you doesn't automatically expand without a check on their power.
What Happens Next?
The case now returns to the Fourth Circuit Court of Appeals. That court must decide if the specific multi-step warrant used in this case was 'reasonable' by looking at whether it was specific enough and backed by enough evidence (probable cause). While the Court ruled a search happened, it did not yet decide if Chatrie’s specific arrest was legal.
Explain It Like I'm 12
Imagine you have a personal diary that keeps track of everywhere you go every two minutes. Instead of keeping it in your pocket, you let a friend keep it on their shelf so they can help you remember your favorite places. This case asks: can the police take that diary from your friend and read it without a special reason? The Supreme Court said 'No.' Because that diary shows so much about your private life—like where you go to the doctor or who you visit—the police must follow the rules of the Fourth Amendment to see it. Even though the police were trying to catch a bank robber, the Court said your location history is private, and the government can't just look at it whenever they want.
Broader Context
The ruling builds on the 2018 Carpenter v. United States decision, which protected long-term cell-tower tracking, and applies those privacy principles to the much more precise GPS and Wi-Fi data stored by tech giants. It signals the Court's ongoing effort to ensure that the Fourth Amendment evolves alongside digital tools that would have allowed for 'tireless and absolute surveillance' unknown to the Founders.
Key Players
Okello T. Chatrie
The petitioner who was identified as a robbery suspect through a geofence warrant and challenged the evidence.
Google LLC
The technology company that maintained the 'Location History' database and provided the data to the police.
Justice Kagan
The author of the Court's majority opinion explaining why the search was a Fourth Amendment event.